/* tolua: functions to push C values.
** Support code for Lua bindings.
** Written by Waldemar Celes
** TeCGraf/PUC-Rio
** Apr 2003
** $Id: $
*/

/* This code is free software; you can redistribute it and/or modify it.
** The software provided hereunder is on an "as is" basis, and
** the author has no obligation to provide maintenance, support, updates,
** enhancements, or modifications.
*/

#include "tolua++.h"
#include "lauxlib.h"

#include <stdlib.h>

TOLUA_API void tolua_pushvalue (lua_State* L, int lo)
{
	lua_pushvalue(L,lo);
}

TOLUA_API void tolua_pushboolean (lua_State* L, int value)
{
	lua_pushboolean(L,value);
}

TOLUA_API void tolua_pushnumber (lua_State* L, lua_Number value)
{
	lua_pushnumber(L,value);
}

TOLUA_API void tolua_pushstring (lua_State* L, const char* value)
{
	if (value == NULL)
		lua_pushnil(L);
	else
		lua_pushstring(L,value);
}

TOLUA_API void tolua_pushuserdata (lua_State* L, void* value)
{
	if (value == NULL)
		lua_pushnil(L);
	else
		lua_pushlightuserdata(L,value);
}

TOLUA_API void tolua_pushusertype (lua_State* L, void* value, const char* type)
{
	if (value == NULL)
		lua_pushnil(L);
	else
	{
		luaL_getmetatable(L, type);
		lua_pushstring(L,"tolua_ubox");
		lua_rawget(L,-2);        /* stack: mt ubox */
		if (lua_isnil(L, -1)) {
			lua_pop(L, 1);
			lua_pushstring(L, "tolua_ubox");
			lua_rawget(L, LUA_REGISTRYINDEX);
		};
		lua_pushlightuserdata(L,value);
		lua_rawget(L,-2);                       /* stack: mt ubox ubox[u] */
		if (lua_isnil(L,-1))
		{
			lua_pop(L,1);                          /* stack: mt ubox */
			lua_pushlightuserdata(L,value);
			*(void**)lua_newuserdata(L,sizeof(void *)) = value;   /* stack: mt ubox u newud */
			lua_pushvalue(L,-1);                   /* stack: mt ubox u newud newud */
			lua_insert(L,-4);                      /* stack: mt newud ubox u newud */
			lua_rawset(L,-3);                      /* stack: mt newud ubox */
			lua_pop(L,1);                          /* stack: mt newud */
			/*luaL_getmetatable(L,type);*/
			lua_pushvalue(L, -2);			/* stack: mt newud mt */
			lua_setmetatable(L,-2);			/* stack: mt newud */

#ifdef LUA_VERSION_NUM
			lua_pushvalue(L, TOLUA_NOPEER);
			lua_setfenv(L, -2);
#endif
		}
		else
		{
			/* check the need of updating the metatable to a more specialized class */
			lua_insert(L,-2);                       /* stack: mt ubox[u] ubox */
			lua_pop(L,1);                           /* stack: mt ubox[u] */
			lua_pushstring(L,"tolua_super");
			lua_rawget(L,LUA_REGISTRYINDEX);        /* stack: mt ubox[u] super */
			lua_getmetatable(L,-2);                 /* stack: mt ubox[u] super mt */
			lua_rawget(L,-2);                       /* stack: mt ubox[u] super super[mt] */
			if (lua_istable(L,-1))
			{
				lua_pushstring(L,type);                 /* stack: mt ubox[u] super super[mt] type */
				lua_rawget(L,-2);                       /* stack: mt ubox[u] super super[mt] flag */
				if (lua_toboolean(L,-1) == 1)   /* if true */
				{
					lua_pop(L,3);	/* mt ubox[u]*/
					lua_remove(L, -2);
					return;
				}
			}
			/* type represents a more specilized type */
			/*luaL_getmetatable(L,type);             // stack: mt ubox[u] super super[mt] flag mt */
			lua_pushvalue(L, -5);					/* stack: mt ubox[u] super super[mt] flag mt */
			lua_setmetatable(L,-5);                /* stack: mt ubox[u] super super[mt] flag */
			lua_pop(L,3);                          /* stack: mt ubox[u] */
		}
		lua_remove(L, -2);	/* stack: ubox[u]*/
	}
}

TOLUA_API void tolua_pushusertype_and_takeownership (lua_State* L, void* value, const char* type)
{
	tolua_pushusertype(L,value,type);
	tolua_register_gc(L,lua_gettop(L));
}

TOLUA_API void tolua_pushfieldvalue (lua_State* L, int lo, int index, int v)
{
	lua_pushnumber(L,index);
	lua_pushvalue(L,v);
	lua_settable(L,lo);
}

TOLUA_API void tolua_pushfieldboolean (lua_State* L, int lo, int index, int v)
{
	lua_pushnumber(L,index);
	lua_pushboolean(L,v);
	lua_settable(L,lo);
}


TOLUA_API void tolua_pushfieldnumber (lua_State* L, int lo, int index, lua_Number v)
{
	lua_pushnumber(L,index);
	tolua_pushnumber(L,v);
	lua_settable(L,lo);
}

TOLUA_API void tolua_pushfieldstring (lua_State* L, int lo, int index, const char* v)
{
	lua_pushnumber(L,index);
	tolua_pushstring(L,v);
	lua_settable(L,lo);
}

TOLUA_API void tolua_pushfielduserdata (lua_State* L, int lo, int index, void* v)
{
	lua_pushnumber(L,index);
	tolua_pushuserdata(L,v);
	lua_settable(L,lo);
}

TOLUA_API void tolua_pushfieldusertype (lua_State* L, int lo, int index, void* v, const char* type)
{
	lua_pushnumber(L,index);
	tolua_pushusertype(L,v,type);
	lua_settable(L,lo);
}

TOLUA_API void tolua_pushfieldusertype_and_takeownership (lua_State* L, int lo, int index, void* v, const char* type)
{
	lua_pushnumber(L,index);
	tolua_pushusertype(L,v,type);
	tolua_register_gc(L,lua_gettop(L));
	lua_settable(L,lo);
}

